MC34118
Specifications and Applications Information
VOICE SWITCHED SPEAKERPHONE CIRCUIT
The MC34118 Voice Switched Speakerphone Circuit incorporates the necessary
amplifiers, attenuators, level detectors, and control algorithm to form the heart of a high quality hands-free speakerphone system.
Included are a microphone amplifier with adjustable gain and MUTE control, transmit and Receive attenuators which operate in a complementary manner, level detectors at both input and output of both attenuators, and background noise monitors for both the transmit and receive channels.
A Dial Tone Detector prevents the dial tone from being attenuated by the Receive background noise monitor circuit.
Als...